Quicksilver 8M6012797 Water Pump Kit - Yamaha 60-70hp

Product Description

The Quicksilver 8M6012797 is a complete water pump replacement kit for compatible Yamaha 60–70hp outboard engines. It contains everything needed for a full water pump service, including the housing, and is designed to restore the outboard's cooling system to peak performance. This kit replaces Yamaha OEM 6H3-W0078-02-00 and cross-references Sierra 18-3466.

Kit Contents

• Water pump housing
• Wear plate
• Water pump gaskets
• Mounting bolts and washers (stainless steel)
• Impeller
• Insert cup
• Impeller key
• O-ring

Key Features

• Quicksilver part number: 8M6012797
• Complete water pump kit – includes housing (not impeller-only)
• Premium rubber impeller material for longevity and performance
• Stainless steel hardware for superior corrosion resistance
• Manufactured to rigorous quality standards for exact fit and long service life
• Replaces Yamaha OEM: 6H3-W0078-02-00
• Cross-references Sierra: 18-3466

Engine Compatibility

Confirmed Yamaha outboard applications:

• Yamaha C60, E60, 70 (1992–1996)
• Yamaha T50, T60 (1997 & newer)
• Yamaha 60, C60, P60, 70, C70 (1997–2003)

Fitment Notice

Confirm the engine model and year before ordering. Yamaha 60–70hp outboards span multiple generations with different pump configurations. Match the original pump number 6H3-W0078-02-00 or cross-reference Sierra 18-3466 to verify fitment. If only the impeller needs replacement (housing still serviceable), consider the companion Quicksilver 8M6012798 Impeller Repair Kit instead.

When This Part Needs Replacement

Replace the complete water pump kit when:

• Cooling-water discharge from the tell-tale becomes weak or stops
• The engine overheats or runs hotter than normal
• The impeller blades are cracked, torn, hardened or missing
• The pump housing is worn, scored or cracked
• The pump has operated without water
• Annual or seasonal outboard service is due

Installation Notes

• Flush and cool the engine before service.
• Disconnect the battery.
• Remove the lower unit according to the Yamaha service procedure for the engine model.
• Inspect the driveshaft, gearcase and all mating surfaces before installation.
• Recover any missing impeller fragments from the cooling passages.
• Lubricate the impeller with glycerine or a suitable water-based lubricant before installation.
• Install the new housing, wear plate, gaskets and hardware as specified.
• Reinstall the lower unit and verify strong tell-tale water flow immediately after startup.

Alternate / Cross-Reference Part Numbers

• Quicksilver: 8M6012797
• Yamaha OEM: 6H3-W0078-02-00
• Sierra: 18-3466

Compatible & Related Parts

• Quicksilver 8M6012798 Impeller Repair Kit – Yamaha 60–70hp – impeller-only service kit for same engine (use when housing is still serviceable)
• Yamaha Water Pump Repair Kit 682-W0078-A3-00 – OEM Yamaha water pump repair kit
• Yamaha Thermostat 6H3-12411-20-00 – thermostat for compatible Yamaha 60–70hp engines (service together with pump)
• Sierra 18-3069 Yamaha / Mercury / Mariner Impeller – related Sierra impeller for Yamaha applications

Parts Desk Insight

This is the complete kit including the housing — the right choice when the pump housing is worn, scored or cracked, or when doing a full lower-unit service. If the housing is still in good condition, the Quicksilver 8M6012798 impeller-only kit is the more economical option. Always replace the thermostat at the same time as the water pump on these Yamaha engines to avoid a repeat job.